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（北京交通職業(yè)技術(shù)學(xué)院路橋系， 北京 102200）

［摘要］通過模型試驗(yàn)?zāi)M預(yù)應(yīng)力懸臂樁的變形形態(tài)，分析了模型板嵌固長(zhǎng)度、模型板厚度、土面處水平位移的改變對(duì)其嵌固段變形形態(tài)和土面處水平推力的影響。結(jié)果表明，支護(hù)結(jié)構(gòu)出現(xiàn)“踢腳”型、“轉(zhuǎn)動(dòng)”型、“嵌固”型三種變形形態(tài)；為達(dá)到控制位移的目的，應(yīng)設(shè)計(jì)為“嵌固”型的預(yù)應(yīng)力支護(hù)結(jié)構(gòu)；對(duì)于“嵌固”型的支護(hù)結(jié)構(gòu)，即使支護(hù)結(jié)構(gòu)已發(fā)生較大位移，支護(hù)結(jié)構(gòu)的抗水平荷載能力仍隨位移增加而繼續(xù)增長(zhǎng)，同時(shí)增加嵌固長(zhǎng)度不能有效提高支護(hù)結(jié)構(gòu)抗水平荷載的能力。試驗(yàn)結(jié)果對(duì)于改善支護(hù)結(jié)構(gòu)性狀，減小變形，節(jié)約工程造價(jià)和保護(hù)環(huán)境，具有一定的工程應(yīng)用價(jià)值。

［關(guān)鍵詞］基坑工程； 懸臂樁； 預(yù)應(yīng)力； 模型試驗(yàn)

中圖分類號(hào)：TU398-7文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)23-0118-05

Model test study on deformation behavior of prestressed cantilever pile

YANG Wensheng

(Road & Bridge Department, Beijing Traffic Vocational Technical College, Beijing 102200, China)

Abstract:Through model test, the deformation of prestressed cantilever pile was simulated, and the influence of embedded length of the model plate, the thickness of the model plate and the horizontal displacement at the soil surface on the deformation of the embedded segment and the horizontal thrust at the soil surface were analyzed. The results show that supporting structure has three deformation forms: “kicking” type, “rotating” type, and “embedded” type. In order to control the displacement, the "embedded" type prestressed supporting structure should be designed.  For "embedded" type supporting structure, the horizontal load-resisting capacity of the supporting structure increases with increase of the displacement, even though the displacement of the supporting structure has already been larger, at the same time, increasing the embedded length can not effectively improve the horizontal load-resistance of the supporting structure. The test results have certain engineering application value for improving behavior of supporting structure, reducing deformation, saving engineering cost and protecting environment.

Keywords:foundation pit engineering; cantilever pile; prestress; model test

*北京市自然科學(xué)基金資助項(xiàng)目（8192050）。

作者簡(jiǎn)介：楊文生，碩士，副教授，Email:xlydjs@163.com。